x + x + 30 = 170
2x = 170 - 30
2x = 140
x = 70
He has 70 stamps in one book. How many does he have in the other book?
Doug has 170 stamps in his two-book collection. his first book of stamps has 30 more stamps in it than his second book. How mwny stamps are in each book?
3 answers
100
Right.